Mission to Lars is a documentary about a 40-year-old man with learning difficulties called Tom Spicer whose dream was to meet Lars Ulrich of the heavy metal band Metallica.
Tom's sister Kate told the Today programme how they undertook the road trip because they wanted to reconnect with him.
Although there were many fearful episodes, when he met Lars, "he had a smile so big it practically didn't fit on his face".
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